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-rw-r--r--.venv/lib/python3.12/site-packages/grpc/framework/interfaces/__init__.py13
-rw-r--r--.venv/lib/python3.12/site-packages/grpc/framework/interfaces/base/__init__.py13
-rw-r--r--.venv/lib/python3.12/site-packages/grpc/framework/interfaces/base/base.py328
-rw-r--r--.venv/lib/python3.12/site-packages/grpc/framework/interfaces/base/utilities.py83
-rw-r--r--.venv/lib/python3.12/site-packages/grpc/framework/interfaces/face/__init__.py13
-rw-r--r--.venv/lib/python3.12/site-packages/grpc/framework/interfaces/face/face.py1084
-rw-r--r--.venv/lib/python3.12/site-packages/grpc/framework/interfaces/face/utilities.py245
7 files changed, 1779 insertions, 0 deletions
diff --git a/.venv/lib/python3.12/site-packages/grpc/framework/interfaces/__init__.py b/.venv/lib/python3.12/site-packages/grpc/framework/interfaces/__init__.py
new file mode 100644
index 00000000..5fb4f3c3
--- /dev/null
+++ b/.venv/lib/python3.12/site-packages/grpc/framework/interfaces/__init__.py
@@ -0,0 +1,13 @@
+# Copyright 2015 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
diff --git a/.venv/lib/python3.12/site-packages/grpc/framework/interfaces/base/__init__.py b/.venv/lib/python3.12/site-packages/grpc/framework/interfaces/base/__init__.py
new file mode 100644
index 00000000..5fb4f3c3
--- /dev/null
+++ b/.venv/lib/python3.12/site-packages/grpc/framework/interfaces/base/__init__.py
@@ -0,0 +1,13 @@
+# Copyright 2015 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
diff --git a/.venv/lib/python3.12/site-packages/grpc/framework/interfaces/base/base.py b/.venv/lib/python3.12/site-packages/grpc/framework/interfaces/base/base.py
new file mode 100644
index 00000000..ea71ff6a
--- /dev/null
+++ b/.venv/lib/python3.12/site-packages/grpc/framework/interfaces/base/base.py
@@ -0,0 +1,328 @@
+# Copyright 2015 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""The base interface of RPC Framework.
+
+Implementations of this interface support the conduct of "operations":
+exchanges between two distinct ends of an arbitrary number of data payloads
+and metadata such as a name for the operation, initial and terminal metadata
+in each direction, and flow control. These operations may be used for transfers
+of data, remote procedure calls, status indication, or anything else
+applications choose.
+"""
+
+# threading is referenced from specification in this module.
+import abc
+import enum
+import threading  # pylint: disable=unused-import
+
+# pylint: disable=too-many-arguments
+
+
+class NoSuchMethodError(Exception):
+    """Indicates that an unrecognized operation has been called.
+
+    Attributes:
+      code: A code value to communicate to the other side of the operation
+        along with indication of operation termination. May be None.
+      details: A details value to communicate to the other side of the
+        operation along with indication of operation termination. May be None.
+    """
+
+    def __init__(self, code, details):
+        """Constructor.
+
+        Args:
+          code: A code value to communicate to the other side of the operation
+            along with indication of operation termination. May be None.
+          details: A details value to communicate to the other side of the
+            operation along with indication of operation termination. May be None.
+        """
+        super(NoSuchMethodError, self).__init__()
+        self.code = code
+        self.details = details
+
+
+class Outcome(object):
+    """The outcome of an operation.
+
+    Attributes:
+      kind: A Kind value coarsely identifying how the operation terminated.
+      code: An application-specific code value or None if no such value was
+        provided.
+      details: An application-specific details value or None if no such value was
+        provided.
+    """
+
+    @enum.unique
+    class Kind(enum.Enum):
+        """Ways in which an operation can terminate."""
+
+        COMPLETED = "completed"
+        CANCELLED = "cancelled"
+        EXPIRED = "expired"
+        LOCAL_SHUTDOWN = "local shutdown"
+        REMOTE_SHUTDOWN = "remote shutdown"
+        RECEPTION_FAILURE = "reception failure"
+        TRANSMISSION_FAILURE = "transmission failure"
+        LOCAL_FAILURE = "local failure"
+        REMOTE_FAILURE = "remote failure"
+
+
+class Completion(abc.ABC):
+    """An aggregate of the values exchanged upon operation completion.
+
+    Attributes:
+      terminal_metadata: A terminal metadata value for the operation.
+      code: A code value for the operation.
+      message: A message value for the operation.
+    """
+
+
+class OperationContext(abc.ABC):
+    """Provides operation-related information and action."""
+
+    @abc.abstractmethod
+    def outcome(self):
+        """Indicates the operation's outcome (or that the operation is ongoing).
+
+        Returns:
+          None if the operation is still active or the Outcome value for the
+            operation if it has terminated.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def add_termination_callback(self, callback):
+        """Adds a function to be called upon operation termination.
+
+        Args:
+          callback: A callable to be passed an Outcome value on operation
+            termination.
+
+        Returns:
+          None if the operation has not yet terminated and the passed callback will
+            later be called when it does terminate, or if the operation has already
+            terminated an Outcome value describing the operation termination and the
+            passed callback will not be called as a result of this method call.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def time_remaining(self):
+        """Describes the length of allowed time remaining for the operation.
+
+        Returns:
+          A nonnegative float indicating the length of allowed time in seconds
+          remaining for the operation to complete before it is considered to have
+          timed out. Zero is returned if the operation has terminated.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def cancel(self):
+        """Cancels the operation if the operation has not yet terminated."""
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def fail(self, exception):
+        """Indicates that the operation has failed.
+
+        Args:
+          exception: An exception germane to the operation failure. May be None.
+        """
+        raise NotImplementedError()
+
+
+class Operator(abc.ABC):
+    """An interface through which to participate in an operation."""
+
+    @abc.abstractmethod
+    def advance(
+        self,
+        initial_metadata=None,
+        payload=None,
+        completion=None,
+        allowance=None,
+    ):
+        """Progresses the operation.
+
+        Args:
+          initial_metadata: An initial metadata value. Only one may ever be
+            communicated in each direction for an operation, and they must be
+            communicated no later than either the first payload or the completion.
+          payload: A payload value.
+          completion: A Completion value. May only ever be non-None once in either
+            direction, and no payloads may be passed after it has been communicated.
+          allowance: A positive integer communicating the number of additional
+            payloads allowed to be passed by the remote side of the operation.
+        """
+        raise NotImplementedError()
+
+
+class ProtocolReceiver(abc.ABC):
+    """A means of receiving protocol values during an operation."""
+
+    @abc.abstractmethod
+    def context(self, protocol_context):
+        """Accepts the protocol context object for the operation.
+
+        Args:
+          protocol_context: The protocol context object for the operation.
+        """
+        raise NotImplementedError()
+
+
+class Subscription(abc.ABC):
+    """Describes customer code's interest in values from the other side.
+
+    Attributes:
+      kind: A Kind value describing the overall kind of this value.
+      termination_callback: A callable to be passed the Outcome associated with
+        the operation after it has terminated. Must be non-None if kind is
+        Kind.TERMINATION_ONLY. Must be None otherwise.
+      allowance: A callable behavior that accepts positive integers representing
+        the number of additional payloads allowed to be passed to the other side
+        of the operation. Must be None if kind is Kind.FULL. Must not be None
+        otherwise.
+      operator: An Operator to be passed values from the other side of the
+        operation. Must be non-None if kind is Kind.FULL. Must be None otherwise.
+      protocol_receiver: A ProtocolReceiver to be passed protocol objects as they
+        become available during the operation. Must be non-None if kind is
+        Kind.FULL.
+    """
+
+    @enum.unique
+    class Kind(enum.Enum):
+        NONE = "none"
+        TERMINATION_ONLY = "termination only"
+        FULL = "full"
+
+
+class Servicer(abc.ABC):
+    """Interface for service implementations."""
+
+    @abc.abstractmethod
+    def service(self, group, method, context, output_operator):
+        """Services an operation.
+
+        Args:
+          group: The group identifier of the operation to be serviced.
+          method: The method identifier of the operation to be serviced.
+          context: An OperationContext object affording contextual information and
+            actions.
+          output_operator: An Operator that will accept output values of the
+            operation.
+
+        Returns:
+          A Subscription via which this object may or may not accept more values of
+            the operation.
+
+        Raises:
+          NoSuchMethodError: If this Servicer does not handle operations with the
+            given group and method.
+          abandonment.Abandoned: If the operation has been aborted and there no
+            longer is any reason to service the operation.
+        """
+        raise NotImplementedError()
+
+
+class End(abc.ABC):
+    """Common type for entry-point objects on both sides of an operation."""
+
+    @abc.abstractmethod
+    def start(self):
+        """Starts this object's service of operations."""
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def stop(self, grace):
+        """Stops this object's service of operations.
+
+        This object will refuse service of new operations as soon as this method is
+        called but operations under way at the time of the call may be given a
+        grace period during which they are allowed to finish.
+
+        Args:
+          grace: A duration of time in seconds to allow ongoing operations to
+            terminate before being forcefully terminated by the stopping of this
+            End. May be zero to terminate all ongoing operations and immediately
+            stop.
+
+        Returns:
+          A threading.Event that will be set to indicate all operations having
+            terminated and this End having completely stopped. The returned event
+            may not be set until after the full grace period (if some ongoing
+            operation continues for the full length of the period) or it may be set
+            much sooner (if for example this End had no operations in progress at
+            the time its stop method was called).
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def operate(
+        self,
+        group,
+        method,
+        subscription,
+        timeout,
+        initial_metadata=None,
+        payload=None,
+        completion=None,
+        protocol_options=None,
+    ):
+        """Commences an operation.
+
+        Args:
+          group: The group identifier of the invoked operation.
+          method: The method identifier of the invoked operation.
+          subscription: A Subscription to which the results of the operation will be
+            passed.
+          timeout: A length of time in seconds to allow for the operation.
+          initial_metadata: An initial metadata value to be sent to the other side
+            of the operation. May be None if the initial metadata will be later
+            passed via the returned operator or if there will be no initial metadata
+            passed at all.
+          payload: An initial payload for the operation.
+          completion: A Completion value indicating the end of transmission to the
+            other side of the operation.
+          protocol_options: A value specified by the provider of a Base interface
+            implementation affording custom state and behavior.
+
+        Returns:
+          A pair of objects affording information about the operation and action
+            continuing the operation. The first element of the returned pair is an
+            OperationContext for the operation and the second element of the
+            returned pair is an Operator to which operation values not passed in
+            this call should later be passed.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def operation_stats(self):
+        """Reports the number of terminated operations broken down by outcome.
+
+        Returns:
+          A dictionary from Outcome.Kind value to an integer identifying the number
+            of operations that terminated with that outcome kind.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def add_idle_action(self, action):
+        """Adds an action to be called when this End has no ongoing operations.
+
+        Args:
+          action: A callable that accepts no arguments.
+        """
+        raise NotImplementedError()
diff --git a/.venv/lib/python3.12/site-packages/grpc/framework/interfaces/base/utilities.py b/.venv/lib/python3.12/site-packages/grpc/framework/interfaces/base/utilities.py
new file mode 100644
index 00000000..5b601f3b
--- /dev/null
+++ b/.venv/lib/python3.12/site-packages/grpc/framework/interfaces/base/utilities.py
@@ -0,0 +1,83 @@
+# Copyright 2015 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Utilities for use with the base interface of RPC Framework."""
+
+import collections
+
+from grpc.framework.interfaces.base import base
+
+
+class _Completion(
+    base.Completion,
+    collections.namedtuple(
+        "_Completion",
+        (
+            "terminal_metadata",
+            "code",
+            "message",
+        ),
+    ),
+):
+    """A trivial implementation of base.Completion."""
+
+
+class _Subscription(
+    base.Subscription,
+    collections.namedtuple(
+        "_Subscription",
+        (
+            "kind",
+            "termination_callback",
+            "allowance",
+            "operator",
+            "protocol_receiver",
+        ),
+    ),
+):
+    """A trivial implementation of base.Subscription."""
+
+
+_NONE_SUBSCRIPTION = _Subscription(
+    base.Subscription.Kind.NONE, None, None, None, None
+)
+
+
+def completion(terminal_metadata, code, message):
+    """Creates a base.Completion aggregating the given operation values.
+
+    Args:
+      terminal_metadata: A terminal metadata value for an operation.
+      code: A code value for an operation.
+      message: A message value for an operation.
+
+    Returns:
+      A base.Completion aggregating the given operation values.
+    """
+    return _Completion(terminal_metadata, code, message)
+
+
+def full_subscription(operator, protocol_receiver):
+    """Creates a "full" base.Subscription for the given base.Operator.
+
+    Args:
+      operator: A base.Operator to be used in an operation.
+      protocol_receiver: A base.ProtocolReceiver to be used in an operation.
+
+    Returns:
+      A base.Subscription of kind base.Subscription.Kind.FULL wrapping the given
+        base.Operator and base.ProtocolReceiver.
+    """
+    return _Subscription(
+        base.Subscription.Kind.FULL, None, None, operator, protocol_receiver
+    )
diff --git a/.venv/lib/python3.12/site-packages/grpc/framework/interfaces/face/__init__.py b/.venv/lib/python3.12/site-packages/grpc/framework/interfaces/face/__init__.py
new file mode 100644
index 00000000..5fb4f3c3
--- /dev/null
+++ b/.venv/lib/python3.12/site-packages/grpc/framework/interfaces/face/__init__.py
@@ -0,0 +1,13 @@
+# Copyright 2015 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
diff --git a/.venv/lib/python3.12/site-packages/grpc/framework/interfaces/face/face.py b/.venv/lib/python3.12/site-packages/grpc/framework/interfaces/face/face.py
new file mode 100644
index 00000000..9239fcc9
--- /dev/null
+++ b/.venv/lib/python3.12/site-packages/grpc/framework/interfaces/face/face.py
@@ -0,0 +1,1084 @@
+# Copyright 2015 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Interfaces defining the Face layer of RPC Framework."""
+
+import abc
+import collections
+import enum
+
+# cardinality, style, abandonment, future, and stream are
+# referenced from specification in this module.
+from grpc.framework.common import cardinality  # pylint: disable=unused-import
+from grpc.framework.common import style  # pylint: disable=unused-import
+from grpc.framework.foundation import future  # pylint: disable=unused-import
+from grpc.framework.foundation import stream  # pylint: disable=unused-import
+
+# pylint: disable=too-many-arguments
+
+
+class NoSuchMethodError(Exception):
+    """Raised by customer code to indicate an unrecognized method.
+
+    Attributes:
+      group: The group of the unrecognized method.
+      name: The name of the unrecognized method.
+    """
+
+    def __init__(self, group, method):
+        """Constructor.
+
+        Args:
+          group: The group identifier of the unrecognized RPC name.
+          method: The method identifier of the unrecognized RPC name.
+        """
+        super(NoSuchMethodError, self).__init__()
+        self.group = group
+        self.method = method
+
+    def __repr__(self):
+        return "face.NoSuchMethodError(%s, %s)" % (
+            self.group,
+            self.method,
+        )
+
+
+class Abortion(
+    collections.namedtuple(
+        "Abortion",
+        (
+            "kind",
+            "initial_metadata",
+            "terminal_metadata",
+            "code",
+            "details",
+        ),
+    )
+):
+    """A value describing RPC abortion.
+
+    Attributes:
+      kind: A Kind value identifying how the RPC failed.
+      initial_metadata: The initial metadata from the other side of the RPC or
+        None if no initial metadata value was received.
+      terminal_metadata: The terminal metadata from the other side of the RPC or
+        None if no terminal metadata value was received.
+      code: The code value from the other side of the RPC or None if no code value
+        was received.
+      details: The details value from the other side of the RPC or None if no
+        details value was received.
+    """
+
+    @enum.unique
+    class Kind(enum.Enum):
+        """Types of RPC abortion."""
+
+        CANCELLED = "cancelled"
+        EXPIRED = "expired"
+        LOCAL_SHUTDOWN = "local shutdown"
+        REMOTE_SHUTDOWN = "remote shutdown"
+        NETWORK_FAILURE = "network failure"
+        LOCAL_FAILURE = "local failure"
+        REMOTE_FAILURE = "remote failure"
+
+
+class AbortionError(Exception, metaclass=abc.ABCMeta):
+    """Common super type for exceptions indicating RPC abortion.
+
+    initial_metadata: The initial metadata from the other side of the RPC or
+      None if no initial metadata value was received.
+    terminal_metadata: The terminal metadata from the other side of the RPC or
+      None if no terminal metadata value was received.
+    code: The code value from the other side of the RPC or None if no code value
+      was received.
+    details: The details value from the other side of the RPC or None if no
+      details value was received.
+    """
+
+    def __init__(self, initial_metadata, terminal_metadata, code, details):
+        super(AbortionError, self).__init__()
+        self.initial_metadata = initial_metadata
+        self.terminal_metadata = terminal_metadata
+        self.code = code
+        self.details = details
+
+    def __str__(self):
+        return '%s(code=%s, details="%s")' % (
+            self.__class__.__name__,
+            self.code,
+            self.details,
+        )
+
+
+class CancellationError(AbortionError):
+    """Indicates that an RPC has been cancelled."""
+
+
+class ExpirationError(AbortionError):
+    """Indicates that an RPC has expired ("timed out")."""
+
+
+class LocalShutdownError(AbortionError):
+    """Indicates that an RPC has terminated due to local shutdown of RPCs."""
+
+
+class RemoteShutdownError(AbortionError):
+    """Indicates that an RPC has terminated due to remote shutdown of RPCs."""
+
+
+class NetworkError(AbortionError):
+    """Indicates that some error occurred on the network."""
+
+
+class LocalError(AbortionError):
+    """Indicates that an RPC has terminated due to a local defect."""
+
+
+class RemoteError(AbortionError):
+    """Indicates that an RPC has terminated due to a remote defect."""
+
+
+class RpcContext(abc.ABC):
+    """Provides RPC-related information and action."""
+
+    @abc.abstractmethod
+    def is_active(self):
+        """Describes whether the RPC is active or has terminated."""
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def time_remaining(self):
+        """Describes the length of allowed time remaining for the RPC.
+
+        Returns:
+          A nonnegative float indicating the length of allowed time in seconds
+          remaining for the RPC to complete before it is considered to have timed
+          out.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def add_abortion_callback(self, abortion_callback):
+        """Registers a callback to be called if the RPC is aborted.
+
+        Args:
+          abortion_callback: A callable to be called and passed an Abortion value
+            in the event of RPC abortion.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def cancel(self):
+        """Cancels the RPC.
+
+        Idempotent and has no effect if the RPC has already terminated.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def protocol_context(self):
+        """Accesses a custom object specified by an implementation provider.
+
+        Returns:
+          A value specified by the provider of a Face interface implementation
+            affording custom state and behavior.
+        """
+        raise NotImplementedError()
+
+
+class Call(RpcContext, metaclass=abc.ABCMeta):
+    """Invocation-side utility object for an RPC."""
+
+    @abc.abstractmethod
+    def initial_metadata(self):
+        """Accesses the initial metadata from the service-side of the RPC.
+
+        This method blocks until the value is available or is known not to have been
+        emitted from the service-side of the RPC.
+
+        Returns:
+          The initial metadata object emitted by the service-side of the RPC, or
+            None if there was no such value.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def terminal_metadata(self):
+        """Accesses the terminal metadata from the service-side of the RPC.
+
+        This method blocks until the value is available or is known not to have been
+        emitted from the service-side of the RPC.
+
+        Returns:
+          The terminal metadata object emitted by the service-side of the RPC, or
+            None if there was no such value.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def code(self):
+        """Accesses the code emitted by the service-side of the RPC.
+
+        This method blocks until the value is available or is known not to have been
+        emitted from the service-side of the RPC.
+
+        Returns:
+          The code object emitted by the service-side of the RPC, or None if there
+            was no such value.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def details(self):
+        """Accesses the details value emitted by the service-side of the RPC.
+
+        This method blocks until the value is available or is known not to have been
+        emitted from the service-side of the RPC.
+
+        Returns:
+          The details value emitted by the service-side of the RPC, or None if there
+            was no such value.
+        """
+        raise NotImplementedError()
+
+
+class ServicerContext(RpcContext, metaclass=abc.ABCMeta):
+    """A context object passed to method implementations."""
+
+    @abc.abstractmethod
+    def invocation_metadata(self):
+        """Accesses the metadata from the invocation-side of the RPC.
+
+        This method blocks until the value is available or is known not to have been
+        emitted from the invocation-side of the RPC.
+
+        Returns:
+          The metadata object emitted by the invocation-side of the RPC, or None if
+            there was no such value.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def initial_metadata(self, initial_metadata):
+        """Accepts the service-side initial metadata value of the RPC.
+
+        This method need not be called by method implementations if they have no
+        service-side initial metadata to transmit.
+
+        Args:
+          initial_metadata: The service-side initial metadata value of the RPC to
+            be transmitted to the invocation side of the RPC.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def terminal_metadata(self, terminal_metadata):
+        """Accepts the service-side terminal metadata value of the RPC.
+
+        This method need not be called by method implementations if they have no
+        service-side terminal metadata to transmit.
+
+        Args:
+          terminal_metadata: The service-side terminal metadata value of the RPC to
+            be transmitted to the invocation side of the RPC.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def code(self, code):
+        """Accepts the service-side code of the RPC.
+
+        This method need not be called by method implementations if they have no
+        code to transmit.
+
+        Args:
+          code: The code of the RPC to be transmitted to the invocation side of the
+            RPC.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def details(self, details):
+        """Accepts the service-side details of the RPC.
+
+        This method need not be called by method implementations if they have no
+        service-side details to transmit.
+
+        Args:
+          details: The service-side details value of the RPC to be transmitted to
+            the invocation side of the RPC.
+        """
+        raise NotImplementedError()
+
+
+class ResponseReceiver(abc.ABC):
+    """Invocation-side object used to accept the output of an RPC."""
+
+    @abc.abstractmethod
+    def initial_metadata(self, initial_metadata):
+        """Receives the initial metadata from the service-side of the RPC.
+
+        Args:
+          initial_metadata: The initial metadata object emitted from the
+            service-side of the RPC.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def response(self, response):
+        """Receives a response from the service-side of the RPC.
+
+        Args:
+          response: A response object emitted from the service-side of the RPC.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def complete(self, terminal_metadata, code, details):
+        """Receives the completion values emitted from the service-side of the RPC.
+
+        Args:
+          terminal_metadata: The terminal metadata object emitted from the
+            service-side of the RPC.
+          code: The code object emitted from the service-side of the RPC.
+          details: The details object emitted from the service-side of the RPC.
+        """
+        raise NotImplementedError()
+
+
+class UnaryUnaryMultiCallable(abc.ABC):
+    """Affords invoking a unary-unary RPC in any call style."""
+
+    @abc.abstractmethod
+    def __call__(
+        self,
+        request,
+        timeout,
+        metadata=None,
+        with_call=False,
+        protocol_options=None,
+    ):
+        """Synchronously invokes the underlying RPC.
+
+        Args:
+          request: The request value for the RPC.
+          timeout: A duration of time in seconds to allow for the RPC.
+          metadata: A metadata value to be passed to the service-side of
+            the RPC.
+          with_call: Whether or not to include return a Call for the RPC in addition
+            to the response.
+          protocol_options: A value specified by the provider of a Face interface
+            implementation affording custom state and behavior.
+
+        Returns:
+          The response value for the RPC, and a Call for the RPC if with_call was
+            set to True at invocation.
+
+        Raises:
+          AbortionError: Indicating that the RPC was aborted.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def future(self, request, timeout, metadata=None, protocol_options=None):
+        """Asynchronously invokes the underlying RPC.
+
+        Args:
+          request: The request value for the RPC.
+          timeout: A duration of time in seconds to allow for the RPC.
+          metadata: A metadata value to be passed to the service-side of
+            the RPC.
+          protocol_options: A value specified by the provider of a Face interface
+            implementation affording custom state and behavior.
+
+        Returns:
+          An object that is both a Call for the RPC and a future.Future. In the
+            event of RPC completion, the return Future's result value will be the
+            response value of the RPC. In the event of RPC abortion, the returned
+            Future's exception value will be an AbortionError.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def event(
+        self,
+        request,
+        receiver,
+        abortion_callback,
+        timeout,
+        metadata=None,
+        protocol_options=None,
+    ):
+        """Asynchronously invokes the underlying RPC.
+
+        Args:
+          request: The request value for the RPC.
+          receiver: A ResponseReceiver to be passed the response data of the RPC.
+          abortion_callback: A callback to be called and passed an Abortion value
+            in the event of RPC abortion.
+          timeout: A duration of time in seconds to allow for the RPC.
+          metadata: A metadata value to be passed to the service-side of
+            the RPC.
+          protocol_options: A value specified by the provider of a Face interface
+            implementation affording custom state and behavior.
+
+        Returns:
+          A Call for the RPC.
+        """
+        raise NotImplementedError()
+
+
+class UnaryStreamMultiCallable(abc.ABC):
+    """Affords invoking a unary-stream RPC in any call style."""
+
+    @abc.abstractmethod
+    def __call__(self, request, timeout, metadata=None, protocol_options=None):
+        """Invokes the underlying RPC.
+
+        Args:
+          request: The request value for the RPC.
+          timeout: A duration of time in seconds to allow for the RPC.
+          metadata: A metadata value to be passed to the service-side of
+            the RPC.
+          protocol_options: A value specified by the provider of a Face interface
+            implementation affording custom state and behavior.
+
+        Returns:
+          An object that is both a Call for the RPC and an iterator of response
+            values. Drawing response values from the returned iterator may raise
+            AbortionError indicating abortion of the RPC.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def event(
+        self,
+        request,
+        receiver,
+        abortion_callback,
+        timeout,
+        metadata=None,
+        protocol_options=None,
+    ):
+        """Asynchronously invokes the underlying RPC.
+
+        Args:
+          request: The request value for the RPC.
+          receiver: A ResponseReceiver to be passed the response data of the RPC.
+          abortion_callback: A callback to be called and passed an Abortion value
+            in the event of RPC abortion.
+          timeout: A duration of time in seconds to allow for the RPC.
+          metadata: A metadata value to be passed to the service-side of
+            the RPC.
+          protocol_options: A value specified by the provider of a Face interface
+            implementation affording custom state and behavior.
+
+        Returns:
+          A Call object for the RPC.
+        """
+        raise NotImplementedError()
+
+
+class StreamUnaryMultiCallable(abc.ABC):
+    """Affords invoking a stream-unary RPC in any call style."""
+
+    @abc.abstractmethod
+    def __call__(
+        self,
+        request_iterator,
+        timeout,
+        metadata=None,
+        with_call=False,
+        protocol_options=None,
+    ):
+        """Synchronously invokes the underlying RPC.
+
+        Args:
+          request_iterator: An iterator that yields request values for the RPC.
+          timeout: A duration of time in seconds to allow for the RPC.
+          metadata: A metadata value to be passed to the service-side of
+            the RPC.
+          with_call: Whether or not to include return a Call for the RPC in addition
+            to the response.
+          protocol_options: A value specified by the provider of a Face interface
+            implementation affording custom state and behavior.
+
+        Returns:
+          The response value for the RPC, and a Call for the RPC if with_call was
+            set to True at invocation.
+
+        Raises:
+          AbortionError: Indicating that the RPC was aborted.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def future(
+        self, request_iterator, timeout, metadata=None, protocol_options=None
+    ):
+        """Asynchronously invokes the underlying RPC.
+
+        Args:
+          request_iterator: An iterator that yields request values for the RPC.
+          timeout: A duration of time in seconds to allow for the RPC.
+          metadata: A metadata value to be passed to the service-side of
+            the RPC.
+          protocol_options: A value specified by the provider of a Face interface
+            implementation affording custom state and behavior.
+
+        Returns:
+          An object that is both a Call for the RPC and a future.Future. In the
+            event of RPC completion, the return Future's result value will be the
+            response value of the RPC. In the event of RPC abortion, the returned
+            Future's exception value will be an AbortionError.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def event(
+        self,
+        receiver,
+        abortion_callback,
+        timeout,
+        metadata=None,
+        protocol_options=None,
+    ):
+        """Asynchronously invokes the underlying RPC.
+
+        Args:
+          receiver: A ResponseReceiver to be passed the response data of the RPC.
+          abortion_callback: A callback to be called and passed an Abortion value
+            in the event of RPC abortion.
+          timeout: A duration of time in seconds to allow for the RPC.
+          metadata: A metadata value to be passed to the service-side of
+            the RPC.
+          protocol_options: A value specified by the provider of a Face interface
+            implementation affording custom state and behavior.
+
+        Returns:
+          A single object that is both a Call object for the RPC and a
+            stream.Consumer to which the request values of the RPC should be passed.
+        """
+        raise NotImplementedError()
+
+
+class StreamStreamMultiCallable(abc.ABC):
+    """Affords invoking a stream-stream RPC in any call style."""
+
+    @abc.abstractmethod
+    def __call__(
+        self, request_iterator, timeout, metadata=None, protocol_options=None
+    ):
+        """Invokes the underlying RPC.
+
+        Args:
+          request_iterator: An iterator that yields request values for the RPC.
+          timeout: A duration of time in seconds to allow for the RPC.
+          metadata: A metadata value to be passed to the service-side of
+            the RPC.
+          protocol_options: A value specified by the provider of a Face interface
+            implementation affording custom state and behavior.
+
+        Returns:
+          An object that is both a Call for the RPC and an iterator of response
+            values. Drawing response values from the returned iterator may raise
+            AbortionError indicating abortion of the RPC.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def event(
+        self,
+        receiver,
+        abortion_callback,
+        timeout,
+        metadata=None,
+        protocol_options=None,
+    ):
+        """Asynchronously invokes the underlying RPC.
+
+        Args:
+          receiver: A ResponseReceiver to be passed the response data of the RPC.
+          abortion_callback: A callback to be called and passed an Abortion value
+            in the event of RPC abortion.
+          timeout: A duration of time in seconds to allow for the RPC.
+          metadata: A metadata value to be passed to the service-side of
+            the RPC.
+          protocol_options: A value specified by the provider of a Face interface
+            implementation affording custom state and behavior.
+
+        Returns:
+          A single object that is both a Call object for the RPC and a
+            stream.Consumer to which the request values of the RPC should be passed.
+        """
+        raise NotImplementedError()
+
+
+class MethodImplementation(abc.ABC):
+    """A sum type that describes a method implementation.
+
+    Attributes:
+      cardinality: A cardinality.Cardinality value.
+      style: A style.Service value.
+      unary_unary_inline: The implementation of the method as a callable value
+        that takes a request value and a ServicerContext object and returns a
+        response value. Only non-None if cardinality is
+        cardinality.Cardinality.UNARY_UNARY and style is style.Service.INLINE.
+      unary_stream_inline: The implementation of the method as a callable value
+        that takes a request value and a ServicerContext object and returns an
+        iterator of response values. Only non-None if cardinality is
+        cardinality.Cardinality.UNARY_STREAM and style is style.Service.INLINE.
+      stream_unary_inline: The implementation of the method as a callable value
+        that takes an iterator of request values and a ServicerContext object and
+        returns a response value. Only non-None if cardinality is
+        cardinality.Cardinality.STREAM_UNARY and style is style.Service.INLINE.
+      stream_stream_inline: The implementation of the method as a callable value
+        that takes an iterator of request values and a ServicerContext object and
+        returns an iterator of response values. Only non-None if cardinality is
+        cardinality.Cardinality.STREAM_STREAM and style is style.Service.INLINE.
+      unary_unary_event: The implementation of the method as a callable value that
+        takes a request value, a response callback to which to pass the response
+        value of the RPC, and a ServicerContext. Only non-None if cardinality is
+        cardinality.Cardinality.UNARY_UNARY and style is style.Service.EVENT.
+      unary_stream_event: The implementation of the method as a callable value
+        that takes a request value, a stream.Consumer to which to pass the
+        response values of the RPC, and a ServicerContext. Only non-None if
+        cardinality is cardinality.Cardinality.UNARY_STREAM and style is
+        style.Service.EVENT.
+      stream_unary_event: The implementation of the method as a callable value
+        that takes a response callback to which to pass the response value of the
+        RPC and a ServicerContext and returns a stream.Consumer to which the
+        request values of the RPC should be passed. Only non-None if cardinality
+        is cardinality.Cardinality.STREAM_UNARY and style is style.Service.EVENT.
+      stream_stream_event: The implementation of the method as a callable value
+        that takes a stream.Consumer to which to pass the response values of the
+        RPC and a ServicerContext and returns a stream.Consumer to which the
+        request values of the RPC should be passed. Only non-None if cardinality
+        is cardinality.Cardinality.STREAM_STREAM and style is
+        style.Service.EVENT.
+    """
+
+
+class MultiMethodImplementation(abc.ABC):
+    """A general type able to service many methods."""
+
+    @abc.abstractmethod
+    def service(self, group, method, response_consumer, context):
+        """Services an RPC.
+
+        Args:
+          group: The group identifier of the RPC.
+          method: The method identifier of the RPC.
+          response_consumer: A stream.Consumer to be called to accept the response
+            values of the RPC.
+          context: a ServicerContext object.
+
+        Returns:
+          A stream.Consumer with which to accept the request values of the RPC. The
+            consumer returned from this method may or may not be invoked to
+            completion: in the case of RPC abortion, RPC Framework will simply stop
+            passing values to this object. Implementations must not assume that this
+            object will be called to completion of the request stream or even called
+            at all.
+
+        Raises:
+          abandonment.Abandoned: May or may not be raised when the RPC has been
+            aborted.
+          NoSuchMethodError: If this MultiMethod does not recognize the given group
+            and name for the RPC and is not able to service the RPC.
+        """
+        raise NotImplementedError()
+
+
+class GenericStub(abc.ABC):
+    """Affords RPC invocation via generic methods."""
+
+    @abc.abstractmethod
+    def blocking_unary_unary(
+        self,
+        group,
+        method,
+        request,
+        timeout,
+        metadata=None,
+        with_call=False,
+        protocol_options=None,
+    ):
+        """Invokes a unary-request-unary-response method.
+
+        This method blocks until either returning the response value of the RPC
+        (in the event of RPC completion) or raising an exception (in the event of
+        RPC abortion).
+
+        Args:
+          group: The group identifier of the RPC.
+          method: The method identifier of the RPC.
+          request: The request value for the RPC.
+          timeout: A duration of time in seconds to allow for the RPC.
+          metadata: A metadata value to be passed to the service-side of the RPC.
+          with_call: Whether or not to include return a Call for the RPC in addition
+            to the response.
+          protocol_options: A value specified by the provider of a Face interface
+            implementation affording custom state and behavior.
+
+        Returns:
+          The response value for the RPC, and a Call for the RPC if with_call was
+            set to True at invocation.
+
+        Raises:
+          AbortionError: Indicating that the RPC was aborted.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def future_unary_unary(
+        self,
+        group,
+        method,
+        request,
+        timeout,
+        metadata=None,
+        protocol_options=None,
+    ):
+        """Invokes a unary-request-unary-response method.
+
+        Args:
+          group: The group identifier of the RPC.
+          method: The method identifier of the RPC.
+          request: The request value for the RPC.
+          timeout: A duration of time in seconds to allow for the RPC.
+          metadata: A metadata value to be passed to the service-side of the RPC.
+          protocol_options: A value specified by the provider of a Face interface
+            implementation affording custom state and behavior.
+
+        Returns:
+          An object that is both a Call for the RPC and a future.Future. In the
+            event of RPC completion, the return Future's result value will be the
+            response value of the RPC. In the event of RPC abortion, the returned
+            Future's exception value will be an AbortionError.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def inline_unary_stream(
+        self,
+        group,
+        method,
+        request,
+        timeout,
+        metadata=None,
+        protocol_options=None,
+    ):
+        """Invokes a unary-request-stream-response method.
+
+        Args:
+          group: The group identifier of the RPC.
+          method: The method identifier of the RPC.
+          request: The request value for the RPC.
+          timeout: A duration of time in seconds to allow for the RPC.
+          metadata: A metadata value to be passed to the service-side of the RPC.
+          protocol_options: A value specified by the provider of a Face interface
+            implementation affording custom state and behavior.
+
+        Returns:
+          An object that is both a Call for the RPC and an iterator of response
+            values. Drawing response values from the returned iterator may raise
+            AbortionError indicating abortion of the RPC.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def blocking_stream_unary(
+        self,
+        group,
+        method,
+        request_iterator,
+        timeout,
+        metadata=None,
+        with_call=False,
+        protocol_options=None,
+    ):
+        """Invokes a stream-request-unary-response method.
+
+        This method blocks until either returning the response value of the RPC
+        (in the event of RPC completion) or raising an exception (in the event of
+        RPC abortion).
+
+        Args:
+          group: The group identifier of the RPC.
+          method: The method identifier of the RPC.
+          request_iterator: An iterator that yields request values for the RPC.
+          timeout: A duration of time in seconds to allow for the RPC.
+          metadata: A metadata value to be passed to the service-side of the RPC.
+          with_call: Whether or not to include return a Call for the RPC in addition
+            to the response.
+          protocol_options: A value specified by the provider of a Face interface
+            implementation affording custom state and behavior.
+
+        Returns:
+          The response value for the RPC, and a Call for the RPC if with_call was
+            set to True at invocation.
+
+        Raises:
+          AbortionError: Indicating that the RPC was aborted.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def future_stream_unary(
+        self,
+        group,
+        method,
+        request_iterator,
+        timeout,
+        metadata=None,
+        protocol_options=None,
+    ):
+        """Invokes a stream-request-unary-response method.
+
+        Args:
+          group: The group identifier of the RPC.
+          method: The method identifier of the RPC.
+          request_iterator: An iterator that yields request values for the RPC.
+          timeout: A duration of time in seconds to allow for the RPC.
+          metadata: A metadata value to be passed to the service-side of the RPC.
+          protocol_options: A value specified by the provider of a Face interface
+            implementation affording custom state and behavior.
+
+        Returns:
+          An object that is both a Call for the RPC and a future.Future. In the
+            event of RPC completion, the return Future's result value will be the
+            response value of the RPC. In the event of RPC abortion, the returned
+            Future's exception value will be an AbortionError.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def inline_stream_stream(
+        self,
+        group,
+        method,
+        request_iterator,
+        timeout,
+        metadata=None,
+        protocol_options=None,
+    ):
+        """Invokes a stream-request-stream-response method.
+
+        Args:
+          group: The group identifier of the RPC.
+          method: The method identifier of the RPC.
+          request_iterator: An iterator that yields request values for the RPC.
+          timeout: A duration of time in seconds to allow for the RPC.
+          metadata: A metadata value to be passed to the service-side of the RPC.
+          protocol_options: A value specified by the provider of a Face interface
+            implementation affording custom state and behavior.
+
+        Returns:
+          An object that is both a Call for the RPC and an iterator of response
+            values. Drawing response values from the returned iterator may raise
+            AbortionError indicating abortion of the RPC.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def event_unary_unary(
+        self,
+        group,
+        method,
+        request,
+        receiver,
+        abortion_callback,
+        timeout,
+        metadata=None,
+        protocol_options=None,
+    ):
+        """Event-driven invocation of a unary-request-unary-response method.
+
+        Args:
+          group: The group identifier of the RPC.
+          method: The method identifier of the RPC.
+          request: The request value for the RPC.
+          receiver: A ResponseReceiver to be passed the response data of the RPC.
+          abortion_callback: A callback to be called and passed an Abortion value
+            in the event of RPC abortion.
+          timeout: A duration of time in seconds to allow for the RPC.
+          metadata: A metadata value to be passed to the service-side of the RPC.
+          protocol_options: A value specified by the provider of a Face interface
+            implementation affording custom state and behavior.
+
+        Returns:
+          A Call for the RPC.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def event_unary_stream(
+        self,
+        group,
+        method,
+        request,
+        receiver,
+        abortion_callback,
+        timeout,
+        metadata=None,
+        protocol_options=None,
+    ):
+        """Event-driven invocation of a unary-request-stream-response method.
+
+        Args:
+          group: The group identifier of the RPC.
+          method: The method identifier of the RPC.
+          request: The request value for the RPC.
+          receiver: A ResponseReceiver to be passed the response data of the RPC.
+          abortion_callback: A callback to be called and passed an Abortion value
+            in the event of RPC abortion.
+          timeout: A duration of time in seconds to allow for the RPC.
+          metadata: A metadata value to be passed to the service-side of the RPC.
+          protocol_options: A value specified by the provider of a Face interface
+            implementation affording custom state and behavior.
+
+        Returns:
+          A Call for the RPC.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def event_stream_unary(
+        self,
+        group,
+        method,
+        receiver,
+        abortion_callback,
+        timeout,
+        metadata=None,
+        protocol_options=None,
+    ):
+        """Event-driven invocation of a unary-request-unary-response method.
+
+        Args:
+          group: The group identifier of the RPC.
+          method: The method identifier of the RPC.
+          receiver: A ResponseReceiver to be passed the response data of the RPC.
+          abortion_callback: A callback to be called and passed an Abortion value
+            in the event of RPC abortion.
+          timeout: A duration of time in seconds to allow for the RPC.
+          metadata: A metadata value to be passed to the service-side of the RPC.
+          protocol_options: A value specified by the provider of a Face interface
+            implementation affording custom state and behavior.
+
+        Returns:
+          A pair of a Call object for the RPC and a stream.Consumer to which the
+            request values of the RPC should be passed.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def event_stream_stream(
+        self,
+        group,
+        method,
+        receiver,
+        abortion_callback,
+        timeout,
+        metadata=None,
+        protocol_options=None,
+    ):
+        """Event-driven invocation of a unary-request-stream-response method.
+
+        Args:
+          group: The group identifier of the RPC.
+          method: The method identifier of the RPC.
+          receiver: A ResponseReceiver to be passed the response data of the RPC.
+          abortion_callback: A callback to be called and passed an Abortion value
+            in the event of RPC abortion.
+          timeout: A duration of time in seconds to allow for the RPC.
+          metadata: A metadata value to be passed to the service-side of the RPC.
+          protocol_options: A value specified by the provider of a Face interface
+            implementation affording custom state and behavior.
+
+        Returns:
+          A pair of a Call object for the RPC and a stream.Consumer to which the
+            request values of the RPC should be passed.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def unary_unary(self, group, method):
+        """Creates a UnaryUnaryMultiCallable for a unary-unary method.
+
+        Args:
+          group: The group identifier of the RPC.
+          method: The method identifier of the RPC.
+
+        Returns:
+          A UnaryUnaryMultiCallable value for the named unary-unary method.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def unary_stream(self, group, method):
+        """Creates a UnaryStreamMultiCallable for a unary-stream method.
+
+        Args:
+          group: The group identifier of the RPC.
+          method: The method identifier of the RPC.
+
+        Returns:
+          A UnaryStreamMultiCallable value for the name unary-stream method.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def stream_unary(self, group, method):
+        """Creates a StreamUnaryMultiCallable for a stream-unary method.
+
+        Args:
+          group: The group identifier of the RPC.
+          method: The method identifier of the RPC.
+
+        Returns:
+          A StreamUnaryMultiCallable value for the named stream-unary method.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def stream_stream(self, group, method):
+        """Creates a StreamStreamMultiCallable for a stream-stream method.
+
+        Args:
+          group: The group identifier of the RPC.
+          method: The method identifier of the RPC.
+
+        Returns:
+          A StreamStreamMultiCallable value for the named stream-stream method.
+        """
+        raise NotImplementedError()
+
+
+class DynamicStub(abc.ABC):
+    """Affords RPC invocation via attributes corresponding to afforded methods.
+
+    Instances of this type may be scoped to a single group so that attribute
+    access is unambiguous.
+
+    Instances of this type respond to attribute access as follows: if the
+    requested attribute is the name of a unary-unary method, the value of the
+    attribute will be a UnaryUnaryMultiCallable with which to invoke an RPC; if
+    the requested attribute is the name of a unary-stream method, the value of the
+    attribute will be a UnaryStreamMultiCallable with which to invoke an RPC; if
+    the requested attribute is the name of a stream-unary method, the value of the
+    attribute will be a StreamUnaryMultiCallable with which to invoke an RPC; and
+    if the requested attribute is the name of a stream-stream method, the value of
+    the attribute will be a StreamStreamMultiCallable with which to invoke an RPC.
+    """
diff --git a/.venv/lib/python3.12/site-packages/grpc/framework/interfaces/face/utilities.py b/.venv/lib/python3.12/site-packages/grpc/framework/interfaces/face/utilities.py
new file mode 100644
index 00000000..b02ea530
--- /dev/null
+++ b/.venv/lib/python3.12/site-packages/grpc/framework/interfaces/face/utilities.py
@@ -0,0 +1,245 @@
+# Copyright 2015 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Utilities for RPC Framework's Face interface."""
+
+import collections
+
+# stream is referenced from specification in this module.
+from grpc.framework.common import cardinality
+from grpc.framework.common import style
+from grpc.framework.foundation import stream  # pylint: disable=unused-import
+from grpc.framework.interfaces.face import face
+
+
+class _MethodImplementation(
+    face.MethodImplementation,
+    collections.namedtuple(
+        "_MethodImplementation",
+        [
+            "cardinality",
+            "style",
+            "unary_unary_inline",
+            "unary_stream_inline",
+            "stream_unary_inline",
+            "stream_stream_inline",
+            "unary_unary_event",
+            "unary_stream_event",
+            "stream_unary_event",
+            "stream_stream_event",
+        ],
+    ),
+):
+    pass
+
+
+def unary_unary_inline(behavior):
+    """Creates an face.MethodImplementation for the given behavior.
+
+    Args:
+      behavior: The implementation of a unary-unary RPC method as a callable value
+        that takes a request value and an face.ServicerContext object and
+        returns a response value.
+
+    Returns:
+      An face.MethodImplementation derived from the given behavior.
+    """
+    return _MethodImplementation(
+        cardinality.Cardinality.UNARY_UNARY,
+        style.Service.INLINE,
+        behavior,
+        None,
+        None,
+        None,
+        None,
+        None,
+        None,
+        None,
+    )
+
+
+def unary_stream_inline(behavior):
+    """Creates an face.MethodImplementation for the given behavior.
+
+    Args:
+      behavior: The implementation of a unary-stream RPC method as a callable
+        value that takes a request value and an face.ServicerContext object and
+        returns an iterator of response values.
+
+    Returns:
+      An face.MethodImplementation derived from the given behavior.
+    """
+    return _MethodImplementation(
+        cardinality.Cardinality.UNARY_STREAM,
+        style.Service.INLINE,
+        None,
+        behavior,
+        None,
+        None,
+        None,
+        None,
+        None,
+        None,
+    )
+
+
+def stream_unary_inline(behavior):
+    """Creates an face.MethodImplementation for the given behavior.
+
+    Args:
+      behavior: The implementation of a stream-unary RPC method as a callable
+        value that takes an iterator of request values and an
+        face.ServicerContext object and returns a response value.
+
+    Returns:
+      An face.MethodImplementation derived from the given behavior.
+    """
+    return _MethodImplementation(
+        cardinality.Cardinality.STREAM_UNARY,
+        style.Service.INLINE,
+        None,
+        None,
+        behavior,
+        None,
+        None,
+        None,
+        None,
+        None,
+    )
+
+
+def stream_stream_inline(behavior):
+    """Creates an face.MethodImplementation for the given behavior.
+
+    Args:
+      behavior: The implementation of a stream-stream RPC method as a callable
+        value that takes an iterator of request values and an
+        face.ServicerContext object and returns an iterator of response values.
+
+    Returns:
+      An face.MethodImplementation derived from the given behavior.
+    """
+    return _MethodImplementation(
+        cardinality.Cardinality.STREAM_STREAM,
+        style.Service.INLINE,
+        None,
+        None,
+        None,
+        behavior,
+        None,
+        None,
+        None,
+        None,
+    )
+
+
+def unary_unary_event(behavior):
+    """Creates an face.MethodImplementation for the given behavior.
+
+    Args:
+      behavior: The implementation of a unary-unary RPC method as a callable
+        value that takes a request value, a response callback to which to pass
+        the response value of the RPC, and an face.ServicerContext.
+
+    Returns:
+      An face.MethodImplementation derived from the given behavior.
+    """
+    return _MethodImplementation(
+        cardinality.Cardinality.UNARY_UNARY,
+        style.Service.EVENT,
+        None,
+        None,
+        None,
+        None,
+        behavior,
+        None,
+        None,
+        None,
+    )
+
+
+def unary_stream_event(behavior):
+    """Creates an face.MethodImplementation for the given behavior.
+
+    Args:
+      behavior: The implementation of a unary-stream RPC method as a callable
+        value that takes a request value, a stream.Consumer to which to pass the
+        response values of the RPC, and an face.ServicerContext.
+
+    Returns:
+      An face.MethodImplementation derived from the given behavior.
+    """
+    return _MethodImplementation(
+        cardinality.Cardinality.UNARY_STREAM,
+        style.Service.EVENT,
+        None,
+        None,
+        None,
+        None,
+        None,
+        behavior,
+        None,
+        None,
+    )
+
+
+def stream_unary_event(behavior):
+    """Creates an face.MethodImplementation for the given behavior.
+
+    Args:
+      behavior: The implementation of a stream-unary RPC method as a callable
+        value that takes a response callback to which to pass the response value
+        of the RPC and an face.ServicerContext and returns a stream.Consumer to
+        which the request values of the RPC should be passed.
+
+    Returns:
+      An face.MethodImplementation derived from the given behavior.
+    """
+    return _MethodImplementation(
+        cardinality.Cardinality.STREAM_UNARY,
+        style.Service.EVENT,
+        None,
+        None,
+        None,
+        None,
+        None,
+        None,
+        behavior,
+        None,
+    )
+
+
+def stream_stream_event(behavior):
+    """Creates an face.MethodImplementation for the given behavior.
+
+    Args:
+      behavior: The implementation of a stream-stream RPC method as a callable
+        value that takes a stream.Consumer to which to pass the response values
+        of the RPC and an face.ServicerContext and returns a stream.Consumer to
+        which the request values of the RPC should be passed.
+
+    Returns:
+      An face.MethodImplementation derived from the given behavior.
+    """
+    return _MethodImplementation(
+        cardinality.Cardinality.STREAM_STREAM,
+        style.Service.EVENT,
+        None,
+        None,
+        None,
+        None,
+        None,
+        None,
+        None,
+        behavior,
+    )